Electrofusion Branch Fitting Layout for High-Diameter Pipe T-Branches
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Solution Overview
Problem
Existing electroweldable saddle fittings are unreliable for high diameter pipes due to 'cold zones' that can collapse under pressure and are limited to branches with a diameter reduction, requiring interruptions and pressure reductions for T-branches.
Innovation Solution
An electroweldable branch fitting with a collar and branch sleeve design that uses extensive electrical wire windings for electrofusion welding, eliminating cold zones and allowing T-branches between pipes of the same diameter without pressure reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If known electroweldable saddle fittings are used for high diameter pipes, then the fitting can be applied to create branches, but cold zones are created that cause weak points and can collapse under pressure
Solution Approach 1:
The electrical wire winding is divided into multiple separate windings arranged along the curved annular wall. Each winding creates its own electrofusion zone, and the combination of multiple segmented welding zones ensures complete coverage of the entire curved surface, eliminating cold zones while maintaining reliability for high diameter pipes
Solution Approach 2:
The patent transitions from a single circular wire winding to multiple windings distributed along the curved surface. This dimensional expansion from one continuous loop to multiple distributed windings ensures comprehensive thermal coverage across the entire annular wall surface, eliminating unwelded cold zones
2Adaptability or versatility
If head welding T-shaped fittings is used for T-branches, then T-branches between pipes of the same diameter can be created, but the main pipe continuity is interrupted and maximum pressure must be reduced
Solution Approach 1:
The patent replaces the mechanical head welding process with electrofusion welding. The electrofusion method uses electrical current to heat and fuse the materials together, eliminating the need for mechanical cutting and joining operations that interrupt pipe continuity and require pressure reduction
Solution Approach 2:
The electroweldable branch fitting can create both regular branches with diameter reduction and T-branches between pipes of the same diameter using the same electrofusion welding method. This universal applicability eliminates the need for different welding procedures and maintains pressure tolerance across all branch types
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides reliable, high-pressure sealing and enables the creation of T-branches without interrupting the main pipe, ensuring larger diameter branches and increased pressure tolerance.
Implementation Method 1
The application of an electric current to such wire through a pair of electrical terminals causes the welding by electrofusion of the fitting to the pipe in the annular portion around the branch sleeve
Implementation Method 2
causes the welding by electrofusion of the fitting to the pipe in the annular portion around the branch sleeve
Data Source
AI summary
An electroweldable branch fitting for high diameter pipes comprises at least a first collar (20, 20′) provided with a predetermined radius of curvature (R), wherein the collar (20, 20′) identifies on opposite sides a concave surface (21) and a convex surface (22), further comprising at least one first electrical wire winding (23) associated with the concave surface (21) of the collar (20, 20′) and carrying one first pair of electrical terminals (24), arranged on the convex surface (22) of the collar (20, 20′) for applying an electric current adapted to cause the electrofusion of the collar (20, 20′), wherein the concave surface (21) of the collar (20, 20′) is continuous, i.e. not perforated, and wherein the first electrical wire winding (23) is uniformly distributed on the concave surface (21) at least in the central part thereof, the collar (20, 20′) being provided with a branch sleeve (30), centrally on the convex surface (22), for the connection to a branch pipe, the branch sleeve identifying a blind hole (32) having a bottom wall (32) consisting of the wall of the collar (20, 20′).